In my Parse Class, I have a column of Names. I would like to query for all names that contain searchString = "om". The query should return all names that contain "om" such as `Tom, Dom, Rom, etc.)
I've tried:
searchString = "om" // something non-exact
var query = PFQuery(className: "NamesClass")
query.whereKey("Name", contains: searchString)
query.findObjectsInBackgroundWithBlock {
but Parse doesn't accept contains as a search parameter.
Seems like queries only accept exact strings
For substring matching, you should be using whereKey:containsString:
searchString = "om"
var query = PFQuery(className: "NamesClass")
query.whereKey("Name", containsString: searchString)
query.findObjectsInBackgroundWithBlock {
That should return any NamesClass object where Name has a substring equal to "om". So, Tom, Dominique, and Thomas will be returned. Frank won't.
Related
I have a reference string on which the allowed characters are listed. Then I also have input strings, from which not allowed characters should be replaced with a fixed character, in this example "0".
I can use filter but it removes the characters altogether, does not offer a replacement. Please note that it is not about being alphanumerical, there are ALLOWED non-alphanumerical characters and there are not allowed alphanumerical characters, referenceStr happens to be arbitrary.
var referenceStr = "abcdefg"
var inputStr = "abcqwyzt"
inputStr = inputStr.filter{it in referenceStr}
This yields:
"abc"
But I need:
"abc00000"
I also considered replace but it looks more like when you have a complete reference list of characters that are NOT allowed. My case is the other way around.
Given:
val referenceStr = "abcd][efg"
val replacementChar = '0'
val inputStr = "abcqwyzt[]"
You can do this with a regex [^<referenceStr>], where <referenceStr> should be replaced with referenceStr:
val result = inputStr.replace("[^${Regex.escape(referenceStr)}]".toRegex(), replacementChar.toString())
println(result)
Note that Regex.escape is used to make sure that the characters in referenceStr are all interpreted literally.
Alternatively, use map:
val result = inputStr.map {
if (it !in referenceStr) replacementChar else it
}.joinToString(separator = "")
In the lambda decide whether the current char "it" should be transformed to replacementChar, or itself. map creates a List<Char>, so you need to use joinToString to make the result a String again.
I'm running a filter command on an object in kotlin and trying to match results. I didn't realize until today that an empty string will match any string in a contains query as follows:
var brandname = ""
var brandtofind = "tide"
var result = brandtofind.contains(brandname) //results in true
This is problematic when you are trying to match entries where a string can be empty as follows:
var candidates = this.filter{ product ->
text.contains(product.name) ||
text.contains(product.brandname) //brandname often empty
I get massive numbers of false positives on products without a brand name. How do I alter the query to only match when there is a true match?
You can add a check for product.brandname.isNotBlank(), which is an enhanced verions of isNotEmpty()
var candidates = this.filter{ product ->
text.contains(product.name) ||
(product.brandname.isNotBlank() && text.contains(product.brandname))}
I have a variable nodename = v445 and another variable nodepatch=v445-sctpsv
I want to compare as
if { $nodename == ???????} {
}
so here I just want to compare only part before certain - the second variable could contain more than one - in name, so I just want to extract equivalent string to nodename to compare with.
after string manipulation second part should come up like this:
if { $nodename == "v445"} {
proceed } else {
}
Try
set nodename v445
set nodepatch v445-sctpsv
if {[string match $nodename* $nodepatch]} {
proceed
} else {
}
string match does a glob-style match against a string, in this case the string that starts with the value in $nodename and contains zero or more characters is matched against the string $nodepatch.
If you need to ensure that the dash occurs, use string match $nodename-* $nodepatch instead.
Documentation: if, set, string
I need to use the IN clause in the SQL sentence.
I have data in one table with the type on Int(11).
And Y have a String from another table that is the criteria.
For example, in table A i have the value 3 of type Int.
In table/process B i have the String "0123".
I need to query table A to meet this criteria:
Select * from Table A where attrib_1 IN (0,1,2,3)
Because record n have value 3, it should be returned.
So i'm trying to use .setParameterList, like this:
List<BloqueCruzamiento> bloques = session.createQuery("FROM BloqueCruzamiento AS b WHERE b.anio=:anio AND b.activo=true AND b.grupo=:categoria AND b.pr IN(:pr_set)ORDER BY b.nroParcela, b.cruza, b.pedigree")
.setParameter("anio", grupo.getAnio())
.setParameter("categoria", grupo.getCategoria())
.setParameterList("pr_set", pr_parm)
.list();
the quid is on "pr_set" parameter.
I want to know how to convert a String , "0123", to a Collection of Integers (0,1,2,3).
So I can pass this parameter to setParameterList() method.
Anapproach that I'm right now is to convert the String to a Char Array, then loop, and convert each element into an Integer Array.
Can somebody give anothe solution ?
Regards
you can use code below to get list from String
String s = "0123";
List<Integer> pr_parm = new ArrayList<Integer>();
for(int i=0;i<s.length();i++) {
if (Character.isDigit(s.charAt(i))) {
pr_parm.add(Integer.parseInt(String.valueOf(s.charAt(i))));
}
}
System.out.println(pr_parm);
Then you can use the list in your setParameterList("pr_set", pr_parm)
this was the solution.
String[] sele = grupo.getPr_sel().split(",");
Integer[] pr_parm_int = new Integer[sele.length];
for (int x=0; x<sele.length;x++){
pr_parm_int[x] = Integer.valueOf(sele[x]);
}
the first line is to parse the string and strip comas.
I need to filter out characters like /?-^%{}[];$=*`#|&#'\"<>()+,\. I need replace this with empty string if it is there in the query string. Please help me out. I am using this in ASP pages.
Best idea would be to use a function something along the lines of:
Public Function MakeSQLSafe(ByVal sql As String) As String
'first i'd avoid putting quote chars in as they might be valid? just double them up.
Dim strIllegalChars As String = "/?-^%{}[];$=*`#|&#\<>()+,\"
'replace single quotes with double so they don't cause escape character
If sql.Contains("'") Then
sql = sql.Replace("'", "''")
End If
'need to double up double quotes from what I remember to get them through
If sql.Contains("""") Then
sql = sql.Replace("""", """""")
End If
'remove illegal chars
For Each c As Char In strIllegalChars
If sql.Contains(c.ToString) Then
sql = sql.Replace(c.ToString, "")
End If
Next
Return sql
End Function
This hasn't been tested and it could probably be made more efficient, but it should get you going. Wherever you execute your sql in your app, just wrap the sql in this function to clean the string before execution:
ExecuteSQL(MakeSQLSafe(strSQL))
Hope that helps
As with any string sanitisation, you're much better off working with a whitelist that dictates which characters are allowed, rather than a blacklist of characters that aren't.
This question about filtering HTML tags resulted in an accepted answer suggesting the use of a regular expression to match against a whitelist: How do I filter all HTML tags except a certain whitelist? - I suggest you do something very similar.
I'm using URL Routing and I found this works well, pass each part of your URL to this function. It's more than you need as it converts characters like "&" to "and", but you can modify it to suit:
public static string CleanUrl(this string urlpart) {
// convert accented characters to regular ones
string cleaned = urlpart.Trim().anglicized();
// do some pretty conversions
cleaned = Regex.Replace(cleaned, " ", "-");
cleaned = Regex.Replace(cleaned, "#", "no.");
cleaned = Regex.Replace(cleaned, "&", "and");
cleaned = Regex.Replace(cleaned, "%", "percent");
cleaned = Regex.Replace(cleaned, "#", "at");
// strip all illegal characters like punctuation
cleaned = Regex.Replace(cleaned, "[^A-Za-z0-9- ]", "");
// convert spaces to dashes
cleaned = Regex.Replace(cleaned, " +", "-");
// If we're left with nothing after everything is stripped and cleaned
if (cleaned.Length == 0)
cleaned = "no-description";
// return lowercased string
return cleaned.ToLower();
}
// Convert accented characters to standardized ones
private static string anglicized(this string urlpart) {
string beforeConversion = "àÀâÂäÄáÁéÉèÈêÊëËìÌîÎïÏòÒôÔöÖùÙûÛüÜçÇ’ñ";
string afterConversion = "aAaAaAaAeEeEeEeEiIiIiIoOoOoOuUuUuUcC'n";
string cleaned = urlpart;
for (int i = 0; i < beforeConversion.Length; i++) {
cleaned = Regex.Replace(urlpart, afterConversion[i].ToString(), afterConversion[i].ToString());
}
return cleaned;
// Spanish : ÁÉÍÑÓÚÜ¡¿áéíñóúü"
}